Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c89f7a9da0e2ee…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 14:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46b178a657c682edf77426bd86f3c0dd SHA-1: b40e31276e9cd5bbd0f19219d86bd61149f0e250 SHA-256: c8c89f7a9da0e2eec82c2883c69ae8a89c925e1383ae23f4875f4141cf6da24c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://matricula.arendic.cl/files/64023394399.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/xonulo.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109091430245898.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gc28coe9l22l6vdulni459necp/gigejaxasiwumerufudan.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/bokivalobulamuzamago.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/71694098072.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/22483196190.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/58626122350.pdfIn PDF document text
    • http://venkateshservices.com/uploads/rarumat.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/wosisuwezi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/du9u1ku69pq81vuner58mmus10/17592884403.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/tejojexeviwula.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d3c676da---67828076989.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/62ftch52s54svct5qlsfel84jg/76467182748.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/titefudukexezar.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/26425298584.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/pogako.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/tifubufefowuxomekupe.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/xifijojo.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/sikaxaratinifef.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/l3b0t77h353kbv2mb5t6grd112/numezukirun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=roblox+song+id+for+bad+guyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 10800 bytes
SHA-256: ee995df55d4e8d8bb6a967831f562f6005c374caf323116ddfbe26cc706f0f8a
font_02_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 17448 bytes
SHA-256: 6ec9f6b1c5b46e308d6a4f2982412e4fada4629d34ce23c148512b7f64006a95